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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10323293 B1

PDFFull Text
Date of Patent:
Jun. 18, 2019

Filed:

Dec. 25, 2012

High-carbon hot rolled steel sheet with excellent hardenability and small in-plane anistropy and method for manufacturing the same

Applicant:

Jfe Steel Corporation, Chiyoda-ku, Tokyo, JP;

Inventors:

Yuka Miyamoto, Kawasaki, JP;

Takashi Kobayashi, Kawasaki, JP;

Nobuyuki Nakamura, Fukuyama, JP;

Yoshimasa Funakawa, Fukuyama, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Weiping Zhu

Int. Cl.
CPC ...
C21D 9/46 (2006.01); B21B 3/00 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/08 (2006.01); C22C 38/22 (2006.01); C22C 38/32 (2006.01); B22D 11/12 (2006.01); C21D 1/26 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 3/00 (2013.01); B22D 11/1206 (2013.01); B22D 11/1213 (2013.01); C21D 6/00 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/22 (2013.01); C22C 38/32 (2013.01); C22C 38/60 (2013.01); C21D 1/26 (2013.01); C21D 2211/003 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); Y02P 10/212 (2015.11);
Abstract

A high-carbon hot rolled steel sheet with excellent hardenability and small in-plane anisotropy, and a method for manufacturing the steel sheet are provided. The steel sheet has a chemical composition including, by mass %, C: 0.20 to 0.48%, Si: not more than 0.1%, Mn: not more than 0.5%, P: not more than 0.03%, S: not more than 0.01%, sol. Al: not more than 0.10%, N: not more than 0.005% and B: 0.0005 to 0.0050%, the balance including Fe and inevitable impurities. The steel sheet includes a microstructure containing ferrite and cementite. The cementite has an average grain size of not more than 1.0 μm. The steel sheet has an in-plane anisotropy of r value, Δr, of not more than 0.1 in absolute value.

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